high-temperature box furnaceIt is a high-temperature heating equipment widely used in industrial production and scientific research experiments. It converts electrical energy into thermal energy to meet the process requirements of high-temperature treatment, sintering, and heat treatment of materials. It usually consists of a furnace body, heating elements, insulation layer, temperature control system, and ventilation system. The furnace body is made of thick metal plates to ensure structural stability and high temperature resistance; Heating elements are mostly resistance wires, electric heating tubes, or silicon carbide rods, evenly distributed around the furnace to achieve efficient heating; The insulation layer is composed of ceramic fibers, refractory bricks and other materials to reduce heat loss and improve insulation effect; The temperature control system monitors the temperature inside the furnace in real time through thermocouples, and achieves precise temperature control with the help of PID intelligent controllers; The ventilation system uses fans to exhaust the gas inside the furnace and maintain a dry environment.
high-temperature box furnaceBasic operating procedures:
1. Power on:
Connect the power and turn on the power switch. At this point, the furnace may have been powered on, and the voltmeter and ammeter will display the corresponding values.
Start the power supply of the control cabinet (green button), the touch screen/instrument displays the initial interface, and check the status indicator lights of each system.
2. Temperature program settings:
Set target temperature, heating rate, insulation time and other parameters according to process requirements. For example, the ceramic sintering process may require setting "room temperature → 200 ℃ (rate 5 ℃/min) → 1200 ℃ (holding for 2 hours) → natural cooling".
For complex processes such as multi-stage heating and cooling, segmented settings are made through a programmable controller. For example, Stage 1 involves rapid heating to 300 ℃ at a rate of 10 ℃/min; Stage 2 involves insulation at 300 ℃ for 30 minutes; Stage 4 involves cooling the furnace to room temperature.
Set an over temperature alarm threshold (usually 20-50 ℃ higher than the target temperature) to prevent the furnace temperature from getting out of control. Enable power-off protection, overcurrent protection and other functions to ensure equipment safety.
3. Start heating:
Close the furnace door and start the heating program. Observe whether the heating curve conforms to the preset rate. If the deviation is too large (such as the actual rate being 20% faster than the set rate), pause and adjust the parameters.
In the temperature range of 300-500 ℃, temperature fluctuations may occur due to material phase transition or gas release, and it is necessary to closely monitor the instrument display and manually intervene if necessary.
When approaching the target temperature (such as ≥ 1000 ℃), reduce the number of furnace door openings to avoid cold air entering and causing a sudden drop in furnace temperature or workpiece cracking.
4. Insulation and cooling:
After reaching the target temperature, the system automatically enters insulation mode. Regularly record temperature data to ensure that the fluctuation range is within ± 5 ℃ (precision processes may require ± 1 ℃).
The cooling methods include natural cooling, programmed cooling, and forced air cooling. Natural cooling is suitable for processes that do not require a cooling rate; Program cooling is achieved by setting a cooling curve (such as 5 ℃/min) through a controller, which is suitable for easily oxidizable materials or processes that require phase transition control; Forced air cooling is connected to an external fan to accelerate cooling, but it is necessary to prevent the workpiece from cracking due to thermal stress.